Plants store water and food in the:

       Plants store water in sacs, called vacuoles, in their cells. When the vacuole is full of water, the cells are rigid and firm. ... The cells are said to be turgid. Sometimes, there is not much water in the vacuole.

Explanation:

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer